The invention discloses a mining mobile type power-supply-free water cutter. The mining mobile type power-supply-free water cutter consists of components including a water cutter spray nozzle, a cutter bar, a high-pressure rubber tube, a sand amount regulating handle, a base, a supporting leg, a mixing valve, a foot wheel, a mixing tank, an end cover, a pressure relief valve, a pushing-pulling handle, a one-way valve, an unloading overflow valve, a pressure regulating hand wheel, a pressure flow rate regulating valve, a pressure flow rate regulating handle wheel, a clear water tank, a clear water tank cover, a high-pressure filter, a filter, a booster pump, a shaft coupler, a safety valve, a hydraulic motor, a motor liquid inlet, a motor liquid return hole, a motor liquid return joint, a booster chassis, and the like. The liquid passes through the high-pressure filter through the regulating valve to enter the hydraulic motor for rotating the hydraulic motor, the hydraulic motor drives the booster pump to rotate to generate high-pressure water; the high-pressure water enters the mixing valve through the unloading valve; the mixing valve is used for mixing the high-pressure water with a grinding material in proportion; mixed water is conveyed to the cutter bar through the high-pressure tube; the speed of the water cutter spray nozzle is instantly accelerated to 340m/min so as to generate great dynamic energy to cut a performing element.